Question

Gun-metal (casting) has a yield point of ____________

(a) 30,000 pound-force per square inch

(b) 15,000 pound-force per square inch

(c) 6000 pound-force per square inch

(d) 1000 pound-force per square inch

I got this question during an interview for a job.

This intriguing question comes from Properties of Copper and its Alloys-2 topic in section Copper and its Alloys of Aerospace Materials & Processes

Answer 1

The correct answer is (b) 15,000 pound-force per square inch

Explanation: Gun-metal casting has a yield point of 15,000 pound-force per square inch. Gun-metal (castings) also have a UTI (Ultimate tensile strength) of around 30,000 pound-force per square inch.